I wanted to specify the list of headers that should be included into
the HTML output via <fieldorder> resource tag. Unfortunately -extra-
is added if not found in the <fieldorder> list (IMHO a bug. At least
an undocumented feature :-). Suppressing the '-extra-' headers with
does not work because <excs> seem to be checked before <fieldorder>.
Mhm... shouldn't <excs> only be used if -extra- is specified?
My solution was to remove the automatic addition of -extra- to the
list specified by <fieldorder> (patch below).